The following (FREE!) page is loaded with helpful info for students struggling with homework or needing extra practice, especially in math. There are also literary resources for students wanting a help with reading comprehension or literary analysis. I have used the math practice numerous times to help students assess their preparedness for tests, and it is great because each problem comes with step-by-step solutions.
http://education.yahoo.com/homework_help/;_ylt=AupEN3zY.4MyLlQ.3PEM3njak7MF
Enjoy and let me know your thoughts!